Baruch College, 9-27-16
Prof. L. Tatum
STA 9700: Homework 4 Solutions
1. For n=5, the simple linear regression of y on x yielded the following statistics. Working by
hand and with a simple pocket calculator,
(a) Compute scfw_b1. Show your work on all ques
Baruch College, 9-27-16
Prof. L. Tatum
STA 9700: Homework 4
TBA
1) For n=5, the regression of y on x yielded the following statistics:
Working by hand and with a simple pocket calculator,
(a) Compute scfw_b1. Show your work on all questions involving equa
Baruch College, Fall 2014, Prof. L. Tatum
Name: _
STA 9700 Midterm I
This is a closed book, closed notes exam. Points are shown [ ] brackets. If you run out of
room, use the blank page to the left of your current page and draw a large arrow!
1.) [60] The
Baruch College, Fall 2015, Prof. L. Tatum
Name:_
STA 9700: Midterm 2
This is a closed book, no notes exam. Do all work on this test.
1. The following SAS output for the regression of Price on GI and AS was unfortunately
produced by a faulty printer, so so
Predication interval General Form:
y
ts
1 (1/n)
Regression Model:
Y| x
=
Ecfw_Y =
Yx =
+
x.
+
X,
0 1
0 1
+
0 1
x + .
Derivations:
Q(0,1) =
.
n
y
i
0 1 x i
Eq 3.1
2
i 1
n
Q
2 y i 0 1 x i ( 1)
0
i 1
n
Q
2 y i 0 1 x i ( x i )
1 i 1
n
2 y
i
b 0 b1
STA 2000
Page - 1
Business Statistics
Course Description, Requirements & Syllabus
COURSE DESCRIPTION
This course provides students with the statistical tools and concepts needed in business
applications. Topics include: proper tabular and chart presentati
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
09/21/2016
Homework #3
Chapter 5
Problem 2
z = (x-)/
= 10
a) Since the score is above the mean by 5 points we can conclude that (x-) = 5. By
following the formula of z-score we get z-score = 5/10 = = +0.5
b) z-s
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
10/24/2016
Homework #5
Chapter 8
Problem 2
The alpha level, is a probability value that is used to define the concept of very unlikely in a
hypothesis test.
The critical region is composed of the extreme sample v
-The term statistic refers to a set of mathematical procedures for organizing summarizing and
interpreting information.
-A population is the set of all the individuals of interest in a particular study.
-A sample is a set of individuals selected from a po
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
10/06/2016
Homework #4
Chapter 6
Problem 2
Sampling with replacement allows for two or more samples drawn from a population to be
independent meaning that what is initially picked at the beginning it does not aff
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
10/31/2016
Homework #6
Chapter 10
Problem 2
The standard error measures how much difference is reasonable to expect between a sample
statistic and the population parameter.
Problem 6
a) Variance for sample 1: s2
(12) Analysis of variance (ANOVA) is a hypothesis-testing procedure that is used to evaluate mean differences between two or
more treatments (or populations). The major advantage of ANOVA is that it can be used to compare two or more treatments. H 0:
1=2=
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
11/16/2016
Homework #7
Chapter 12
Problem 2
Both the t-statistic and F-ratio have the same formula however the t-statistic is based on sample
mean difference. F-ratio based on variance. Nonetheless they both lead
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
09/19/2016
Homework #2
Chapter 3
Question 6
Given:
X = 120
N = 15 scores
Population Mean = = X/N
= X/N
=120 / 15
=8
Question 8
Given:
X = 40
=8
N=?
= X/N N = X /
N = 40 / 8
N = 5 scores
Question 10
Given:
M1=
Rei Duraj
STA 2100 SMWA
Prof. Philip Hamid
11/28/2016
Homework #8
Chapter 14
Problem 4
a) The columns which have M=6 and M=12 respectively.
b) The rows which have M=11 and M=7 respectively.
c) There is no interaction between gender and treatment. When gra
hqt*wf
Histqlrerrl
,
J'
c
0l
)
CT
G-,
LI
Di
s
^r^f
\d I -f # N d
(f)
eu
I
cfw_LIffi 4cfw_fficfw_- cfw_"Efdffir cfw_hi tffnft Wfte6.dI\Dr\4Err flp cfw_,#CS
Keauna Parkinson
February 9, 2017
STA 2100
Homework 1
1. A. The answer is Nominal because this question involves a demographic value, the
responses are categorized.
B. The answer is Ratio because this question involves all three properties of scales. It h
The P-value is more a measure of surprise than it is a measure of certainty.
1|Page
_
2|Page
3|Page
4|Page
5|Page
6|Page
7|Page
8|Page
9|Page
10 | P a g e
11 | P a g e
12 | P a g e
13 | P a g e
Z=0.845>0.05, fail to reject
14 | P a g e
When the probability comes from the long-run relative frequency of the event's occurrence, it is an empirical probability.
When the probability is subjective and represents your personal degree of belief, it is called a personal probability.
0.3/0.5 <>0.5